mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 15:37:23 +00:00
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*
|
|
* Add by Alan Lu, 07-29-2005
|
|
* For ATMEL AT24C16 EEPROM
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <i2c.h>
|
|
#ifdef CONFIG_SYS_EEPROM_AT24C16
|
|
#undef DEBUG
|
|
|
|
void eeprom_init(void)
|
|
{
|
|
#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
|
|
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
|
|
#endif
|
|
}
|
|
|
|
int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer,
|
|
unsigned cnt)
|
|
{
|
|
int page, count = 0, i = 0;
|
|
page = offset / 0x100;
|
|
i = offset % 0x100;
|
|
|
|
while (count < cnt) {
|
|
if (i2c_read(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
|
|
return 1;
|
|
if (i > 0xff) {
|
|
page++;
|
|
i = 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
|
|
* 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
|
|
*
|
|
* for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
|
|
* 0x00000nxx for EEPROM address selectors and page number at n.
|
|
*/
|
|
int eeprom_write(unsigned dev_addr, unsigned offset, uchar *buffer,
|
|
unsigned cnt)
|
|
{
|
|
int page, i = 0, count = 0;
|
|
|
|
page = offset / 0x100;
|
|
i = offset % 0x100;
|
|
|
|
while (count < cnt) {
|
|
if (i2c_write(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
|
|
return 1;
|
|
if (i > 0xff) {
|
|
page++;
|
|
i = 0;
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS)
|
|
udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifndef CONFIG_SPI
|
|
int eeprom_probe(unsigned dev_addr, unsigned offset)
|
|
{
|
|
unsigned char chip;
|
|
|
|
/* Probe the chip address */
|
|
#if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
|
|
chip = offset >> 8; /* block number */
|
|
#else
|
|
chip = offset >> 16; /* block number */
|
|
#endif /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
|
|
|
|
chip |= dev_addr; /* insert device address */
|
|
return (i2c_probe(chip));
|
|
}
|
|
#endif
|
|
#endif
|